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US 10,965,380 B1Granted
Apparatus and method for nonlinear equalization based on absolute operation
AssigneeKorea Advanced Institute of Science and Technology
InventorsHoon Kim, Yukui Yu
Life of this patent
Estimating the term…
Abstract
Various example embodiments relate to an apparatus and method for nonlinear equalization based on an absolute operation, and may be configured to generate coefficients and compensate for nonlinear distortions by using an absolute operation for an input signal based the coefficients.
Claims6
An apparatus for nonlinear equalization in an optical communication system, the apparatus for nonlinear equalization comprising:
- an optical electronic device, wherein the optical electronic device comprises:
- a coefficient updating module for generating coefficients;
- and
- a nonlinear equalizer configured to compensate for nonlinear distortions by using an absolute operation for an input signal, based on the coefficients, wherein the nonlinear equalizer uses a function including the absolute operation as one equation selected from the group consisting of:
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- n
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- =
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- n
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-
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- 2
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-
-
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- k
- 1
- =
- 0
- L
- p
- -
- 1
-
- ∑
- k
- 2
- =
- k
- 1
- +
- 1
- L
- p
- -
- 1
-
- K
-
-
- ∑
- k
- p
- =
- k
- p
- -
- 1
- +
- 1
- L
- p
- -
- 1
-
- h
- k
- 1
- ,
- k
- 2
- ,
- …
- ,
- k
- p
- (
- p
- )
-
-
-
-
- x
- n
- -
- k
- 1
-
- -
- x
- n
- -
- k
- 2
-
-
- ∏
- λ
- =
- 3
- p
-
-
- x
- n
- -
- k
- λ
- ;
- wherein the n and k have an integer as a time index, the |⋅| indicates an absolute operator, the xn indicates nth input signal to the nonlinear equalizer, the yn indicates nth output signal from the nonlinear equalizer, and the Lp and the hp indicate memory length and coefficient of pth order terms.
490 more elements
A transmitter, comprising:
- a signal generation unit configured to generate a signal for transmission;
- a nonlinear equalization unit which has a nonlinear equalizer configured to compensate for nonlinear distortions by using an absolute operation for an input signal from the signal generation unit, wherein the nonlinear equalizer uses a function including the absolute operation as one equation selected from the group consisting of:
- (
- i
- )
-
-
- y
- n
- =
- ∑
- k
- 1
- =
- 0
- L
- 1
- -
- 1
-
-
- h
- k
- 1
- (
- 1
- )
-
- x
- n
- -
- k
- 1
- +
- ∑
- p
- =
- 2
- P
-
-
- ∑
- k
- =
- 0
- L
- p
- -
- 1
-
- h
- k
- (
- p
- )
-
-
- x
- n
- -
- k
-
-
- x
- n
- -
- k
- p
- -
- 1
- +
- ∑
- p
- =
- 2
- P
-
-
- ∑
- k
- 1
- =
- 0
- L
- p
- -
- 1
-
- ∑
- k
- 2
- =
- k
- 1
- +
- 1
- L
- p
- -
- 1
-
- K
-
-
- ∑
- k
- p
- =
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-
- h
- k
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- ,
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- (
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- x
- n
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- k
- 1
- +
- x
- n
- -
- k
- 2
-
-
- ∏
- λ
- =
- 3
- p
-
-
- x
- n
- -
- k
- λ
- ;
-
- (
- ii
- )
-
-
- y
- n
- =
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- =
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- =
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- =
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- k
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- p
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-
-
-
- x
- n
- -
- k
- 1
- -
- x
- n
- -
- k
- 2
-
-
- ∏
- λ
- =
- 3
- p
-
-
- x
- n
- -
- k
- λ
- ;
-
- and
-
-
- (
- iii
- )
-
-
- y
- n
- =
- ∑
- k
- 1
- =
- 0
- L
- 1
- -
- 1
-
-
- h
- k
- 1
- (
- 1
- )
-
- x
- n
- -
- k
- 1
- +
- ∑
- p
- =
- 2
- P
-
-
- ∑
- k
- =
- 0
- L
- p
- -
- 1
-
- h
- k
- (
- p
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-
-
- x
- n
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- k
-
-
- x
- n
- -
- k
- p
- -
- 1
- +
- ∑
- p
- =
- 2
- P
-
-
- ∑
- k
- 1
- =
- 0
- L
- p
- -
- 1
-
- ∑
- k
- 2
- =
- k
- 1
- +
- 1
- L
- p
- -
- 1
-
- K
-
-
- ∑
- k
- p
- =
- k
- p
- -
- 1
- +
- 1
- L
- p
- -
- 1
-
- h
- k
- 1
- ,
- k
- 2
- ,
- …
- ,
- k
- p
- (
- p
- )
-
-
-
-
- x
- n
- -
- k
- 1
-
- -
- x
- n
- -
- k
- 2
-
-
- ∏
- λ
- =
- 3
- p
-
-
- x
- n
- -
- k
- λ
- ;
- wherein the n and k have an integer as a time index, the |⋅| indicates an absolute operator, the xn indicates nth input signal to the nonlinear equalizer, the yn indicates nth output signal from the nonlinear equalizer, and the Lp and the hp indicate memory length and coefficient of pth order terms;
- a digital-analog conversion unit configured to perform a digital-analog conversion on an input signal from the nonlinear equalization unit;
- and
- an intensity modulation unit configured to perform intensity modulation on an input signal from the digital-analog conversion unit.
491 more elements
A receiver, comprising:
- a direct detection unit configured to perform directly detection on an input signal;
- an analog-digital conversion unit configured to perform an analog-digital conversion on an input signal from the direct detection unit;
- a nonlinear equalization unit which has a nonlinear equalizer configured to compensate for nonlinear distortions by using an absolute operation for an input signal from the analog-digital conversion unit, wherein the nonlinear equalizer uses a function including the absolute operation as one equation selected from the group consisting of:
- (
- i
- )
-
-
- y
- n
- =
- ∑
- k
- 1
- =
- 0
- L
- 1
- -
- 1
-
-
- h
- k
- 1
- (
- 1
- )
-
- x
- n
- -
- k
- 1
- +
- ∑
- p
- =
- 2
- P
-
-
- ∑
- k
- =
- 0
- L
- p
- -
- 1
-
- h
- k
- (
- p
- )
-
-
- x
- n
- -
- k
-
-
- x
- n
- -
- k
- p
- -
- 1
- +
- ∑
- p
- =
- 2
- P
-
-
- ∑
- k
- 1
- =
- 0
- L
- p
- -
- 1
-
- ∑
- k
- 2
- =
- k
- 1
- +
- 1
- L
- p
- -
- 1
-
- K
-
-
- ∑
- k
- p
- =
- k
- p
- -
- 1
- +
- 1
- L
- p
- -
- 1
-
- h
- k
- 1
- ,
- k
- 2
- ,
- …
- ,
- k
- p
- (
- p
- )
-
-
-
- x
- n
- -
- k
- 1
- +
- x
- n
- -
- k
- 2
-
-
- ∏
- λ
- =
- 3
- p
-
-
- x
- n
- -
- k
- λ
- ;
-
- (
- ii
- )
-
-
- y
- n
- =
- ∑
- k
- 1
- =
- 0
- L
- 1
- -
- 1
-
-
- h
- k
- 1
- (
- 1
- )
-
- x
- n
- -
- k
- 1
- +
- ∑
- p
- =
- 2
- P
-
-
- ∑
- k
- =
- 0
- L
- p
- -
- 1
-
- h
- k
- (
- p
- )
-
-
- x
- n
- -
- k
-
-
- x
- n
- -
- k
- p
- -
- 1
- +
- ∑
- p
- =
- 2
- P
-
-
- ∑
- k
- 1
- =
- 0
- L
- p
- -
- 1
-
- ∑
- k
- 2
- =
- k
- 1
- +
- 1
- L
- p
- -
- 1
-
- K
-
-
- ∑
- k
- p
- =
- k
- p
- -
- 1
- +
- 1
- L
- p
- -
- 1
-
- h
- k
- 1
- ,
- k
- 2
- ,
- …
- ,
- k
- p
- (
- p
- )
-
-
-
-
- x
- n
- -
- k
- 1
- -
- x
- n
- -
- k
- 2
-
-
- ∏
- λ
- =
- 3
- p
-
-
- x
- n
- -
- k
- λ
- ;
-
- and
-
-
- (
- iii
- )
-
-
- y
- n
- =
- ∑
- k
- 1
- =
- 0
- L
- 1
- -
- 1
-
-
- h
- k
- 1
- (
- 1
- )
-
- x
- n
- -
- k
- 1
- +
- ∑
- p
- =
- 2
- P
-
-
- ∑
- k
- =
- 0
- L
- p
- -
- 1
-
- h
- k
- (
- p
- )
-
-
- x
- n
- -
- k
-
-
- x
- n
- -
- k
- p
- -
- 1
- +
- ∑
- p
- =
- 2
- P
-
-
- ∑
- k
- 1
- =
- 0
- L
- p
- -
- 1
-
- ∑
- k
- 2
- =
- k
- 1
- +
- 1
- L
- p
- -
- 1
-
- K
-
-
- ∑
- k
- p
- =
- k
- p
- -
- 1
- +
- 1
- L
- p
- -
- 1
-
- h
- k
- 1
- ,
- k
- 2
- ,
- …
- ,
- k
- p
- (
- p
- )
-
-
-
-
- x
- n
- -
- k
- 1
-
- -
- x
- n
- -
- k
- 2
-
-
- ∏
- λ
- =
- 3
- p
-
-
- x
- n
- -
- k
- λ
- ;
- wherein the n and k have an integer as a time index, the |⋅| indicates an absolute operator, the xn indicates nth input signal to the nonlinear equalizer, the yn indicates nth output signal from the nonlinear equalizer, and the Lp and the hp indicate memory length and coefficient of pth order terms;
- and
- a data recovery unit configured to recover data from an input signal from the nonlinear equalization unit.
491 more elements
Dependencies are inferred from the claim text.